The 5.56x45mm NATO is the primary intermediate cartridge for US Forces. It is characterized by low recoil and high velocity. However, its effectiveness relies on fragmentation and penetration, both of which vary wildly between the variants listed below.

* Visual ID: Bronze/Silver Exposed Tip * Role: Standard Issue (Current) The “EPR” is the modern solution to the shortcomings of older 5.56mm rounds. It features a lead-free slug with a hardened steel penetrator.

• Pros: Best-in-class general penetration; “barrier-blind” (maintains trajectory through glass/wood); consistent lethality against armored AI.
• Cons: Higher chamber pressure; slightly more recoil than legacy rounds.

* Visual ID: Open Tip / Lead Cliff * Role: Carbine / Urban Optimized Developed for the USMC to improve performance in short-barreled weapons like the Mk18. It is designed to fragment on impact while the rear “solid” portion continues through cover.

• Pros: Optimized for CQB; excellent “stopping power” on unarmored targets.
• Cons: Ballistic coefficient is lower than M855A1; performance drops off past 300m.

* Visual ID: Black Ring / Open Tip * Role: Long Range / Marksman A heavy 77-grain Match round. While it lacks a steel penetrator, its mass allows it to retain energy at much longer distances.

• Pros: Highest damage-per-shot in the 5.56 family; extremely stable in high-wind conditions; effective out to 700m.
• Cons: Lower muzzle velocity; poor performance against heavy plating.

* Visual ID: Plain / No Tip * Role: Cold War / High Velocity The original 55-grain round for the M16A1. It relies on extreme velocity to “shatter” (fragment) upon impact.

• Pros: Very high muzzle velocity; devastating against unarmored “insurgent” type targets.
• Cons: Virtually zero penetration against modern body armor; loses effectiveness rapidly from short barrels.

* Visual ID: Green Tip * Role: Legacy Standard (Pre-2010) The “Penetrator” round used for decades. It features a small steel insert.

• Pros: Plentiful in most missions; decent mid-range performance.
• Cons: Infamous for “over-penetration” (passing through targets without damage); struggles against modern Level IV plates.

* Visual ID: Black Tip * Role: Specialized Anti-Armor Utilizes a tungsten carbide core specifically designed to defeat hardened targets.

• Pros: Can penetrate heavy body armor and light vehicle skin (unarmored trucks/technical rails).
• Cons: Very low “flesh damage”; rare availability.

• General Infantry: Standardize on M855A1 (EPR). It is the most reliable round for 90% of Arma 3 engagements.
• Point-men / Breachers: Use Mk318 for superior performance through doors and windows.
• Designated Marksmen: Use Mk262 for a flatter, more predictable trajectory at long range.
• Historical Scenarios: Use M193 for Vietnam/80s era kits, but aim for the head or unarmored limbs.